# CVE-2021-47594: linux: In the Linux kernel, the following vulnerability has been resolved:  mptcp: never allow the PM to close a listener su...

CVE-2021-47594 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47594, released June 19, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47594
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 19, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  mptcp: never allow the PM to close a listener subflow  Currently, when deleting an endpoint the netlink PM treverses all the local MPTCP sockets, regardless of their status.  If an MPTCP listener socket is bound to the IP matching the delete endpoint, the listener TCP socket will be closed. That is unexpected, the PM should only affect data subflows.  Additionally, syzbot was able to trigger a NULL ptr dereference due to the above:  general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 PID: 6550 Comm: syz-executor122 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0xd7d/0x54a0 kernel/locking/lockdep.c:4897 Code: 0f 0e 41 be 01 00 00 00 0f 86 c8 00 00 00 89 05 69 cc 0f 0e e9 bd 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 f3 2f 00 00 48 81 3b 20 75 17 8f 0f 84 52 f3 ff RSP: 0018:ffffc90001f2f818 EFLAGS: 00010016 RAX: dffffc0000000000 RBX: 0000000000000018 RCX: 0000000000000000 RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 000000000000000a R12: 0000000000000000 R13: ffff88801b98d700 R14: 0000000000000000 R15: 0000000000000001 FS:  00007f177cd3d700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f177cd1b268 CR3: 000000001dd55000 CR4: 0000000000350ee0 Call Trace:  <TASK>  lock_acquire kernel/locking/lockdep.c:5637 [inline]  lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602  __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]  _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162  finish_wait+0xc0/0x270 kernel/sched/wait.c:400  inet_csk_wait_for_connect net/ipv4/inet_connection_sock.c:464 [inline]  inet_csk_accept+0x7de/0x9d0 net/ipv4/inet_connection_sock.c:497  mptcp_accept+0xe5/0x500 net/mptcp/protocol.c:2865  inet_accept+0xe4/0x7b0 net/ipv4/af_inet.c:739  mptcp_stream_accept+0x2e7/0x10e0 net/mptcp/protocol.c:3345  do_accept+0x382/0x510 net/socket.c:1773  __sys_accept4_file+0x7e/0xe0 net/socket.c:1816  __sys_accept4+0xb0/0x100 net/socket.c:1846  __do_sys_accept net/socket.c:1864 [inline]  __se_sys_accept net/socket.c:1861 [inline]  __x64_sys_accept+0x71/0xb0 net/socket.c:1861  do_syscall_x64 arch/x86/entry/common.c:50 [inline]  do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80  entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f177cd8b8e9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f177cd3d308 EFLAGS: 00000246 ORIG_RAX: 000000000000002b RAX: ffffffffffffffda RBX: 00007f177ce13408 RCX: 00007f177cd8b8e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f177ce13400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f177ce1340c R13: 00007f177cde1004 R14: 6d705f706374706d R15: 0000000000022000  </TASK>  Fix the issue explicitly skipping MPTCP socket in TCP_LISTEN status.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-47594](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47594.md) | Jun 19, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-47594](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47594.md) | Jun 19, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-47594](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47594.md) | Jun 19, 2024 |

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